Security readout for executives and security teams
Plain-English summary
SWFTools versions through 20200710 contain a crash bug. If an attacker can make the tool process a crafted input, the process may hit a NULL pointer dereference and stop, causing denial of service rather than confirmed data theft or code execution.
Executive priority
Treat as a targeted availability risk. Prioritize if SWFTools is part of customer-facing upload, document conversion, or automated media processing paths. Otherwise handle through normal vulnerability management.
Technical view
CVE-2021-39584 is a NULL pointer dereference in namespace_set_hash() in pool.c in swftools through 20200710. The published impact is denial of service. The sources do not provide CVSS, CWE, affected package metadata, exploit status, or a named fixed version.
Likely exposure
Exposure is most relevant where SWFTools processes untrusted or user-supplied SWF/Flash content, especially automated conversion or upload workflows. Internal-only, manually operated use has lower practical exposure.
Exploitation context
The source bundle does not show CISA KEV listing or public evidence of active exploitation. The described attacker outcome is process denial of service through a NULL pointer dereference.
Researcher notes
Evidence is sparse: the CVE record and linked GitHub issue identify the affected function and DoS impact, but no CVSS vector, CWE, exploit maturity, or fixed version is provided in the bundle. Avoid expanding scope beyond SWFTools through 20200710.
Mitigation direction
- Inventory systems and pipelines that run SWFTools on external files.
- Avoid processing untrusted SWF content until vendor guidance is confirmed.
- Check upstream SWFTools guidance for a fixed release or patch.
- Run file conversion jobs with isolation and resource limits.
- Add queue retry controls so crashes do not block processing.
Validation and detection
- Confirm installed SWFTools versions and compare against through 20200710.
- Identify web uploads, email attachments, or batch jobs feeding SWFTools.
- Review crash logs for namespace_set_hash or pool.c failures.
- Verify conversion services fail closed and recover after worker crashes.
- Confirm compensating controls isolate SWFTools from critical services.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-39584 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/matthiaskramm/swftools/issues/130CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.